.catalyst-concertina{
  display: grid;
  gap: 18px;
}

/* Item border */
.catalyst-concertina__item{
  border-bottom: 2px solid var(--wp--preset--color--brand-pink);
}

/* Header button */
.catalyst-concertina__trigger{
  width: 100%;
  border: 0;
  text-align: left;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;

  padding: 18px 22px;

  background: var(--wp--preset--color--tertiary);
  color: var(--wp--preset--color--secondary);

  cursor: pointer;
}

/* Title */
.catalyst-concertina__title{
  font-weight: 600;
  font-size: 20px;
  line-height: 1.1;
}

/* Chevron (drawn with borders so it matches theme colours) */
.catalyst-concertina__chev{
  width: 24px;
  height: 24px;
  flex: 0 0 auto;

  border-right: 3px solid var(--wp--preset--color--secondary);
  border-bottom: 3px solid var(--wp--preset--color--secondary);

  transform: rotate(45deg);
  transition: transform 220ms ease;
  opacity: 0.95;
}

.catalyst-concertina__trigger[aria-expanded="true"] .catalyst-concertina__chev{
  transform: rotate(225deg);
}

/* Panel: height animated by JS, opacity also transitions */
.catalyst-concertina__panel{
  background: var(--wp--preset--color--secondary);
  color: var(--wp--preset--color--primary);

  transition: height 260ms ease, opacity 220ms ease;
}

.catalyst-concertina__panel-inner{
  padding: 22px;
}

/* WYSIWYG spacing niceties */
.catalyst-concertina__panel-inner > *:first-child{ margin-top: 0; }
.catalyst-concertina__panel-inner > *:last-child{_attach: 0; }